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double column
agric.	双柱分馏器
automat.	双立柱; 龙门
tech.	双柱式
typogr.	双栏排印每页分两栏
double fractionation column
oil	双柱分馏塔 (或器)
double columnd.c.
polygr.	双栏版面

double column: 49 phrases in 19 subjects

Automobiles	7
Bridge construction	1
Business	1
Computer numerical control	1
Customs	1
Economy	3
Electric machinery	1
Finances	1
Hydroelectric power stations	1
International trade	1
Metallurgy	1
Oil / petroleum	1
Polygraphy	2
Refrigeration	1
Securities	2
Shipbuilding	2
Steel production	1
Technology	20
Wind Energy	1